"How I Find Problems to Solve as a Staff Engineer": As Staff Engineer you don't get the ability to choose problems to work on, the problems will find you. But

"How I Find Problems to Solve as a Staff Engineer": As Staff Engineer you don't get the ability to choose problems to work on, the problems will find you. But as he later explains, he needs to decide on some typical app maintainence issues, which have nothing to do with his role as staff engineer.